mitsumi photo ash charge ic with a built-in igbt driver mm3456 photo ash charge ic with a built-in igbt driver monolithic ic mm3456 outline this ic is a photoflash charge ic with a built-in igbt driver, which has functions to charge photoflash capacitors and ash xenon tubes of digital still cameras and cell phones. high ef cient charging is achieved due to built-in switching fet with 40v withstanding voltage and low on resistance (ron = 0.25 ). moreover, the primary peak current limitation up to 2a makes fast charging to the photoflash capacitor possible. furthermore, this ic contains functions such as double protection for battery full-charge detection at the primary and secondary sides, thermal shutdown, and in addition to the igbt driver. this ic uses small sson-10 package. features 1. high ef ciency charging due to built-in switching fet with 40v withstanding voltage and low on resistance (ron = 0.25 ) 2. peak current at the primary side of the transformer is programmable up to1.0-2.0a ( 3 levels, 2 ranks), fast charging 3. built-in igbt driver 4. high accuracy output voltage control ( 1%) 5. input voltage : 2.5v - 6.0v 6. protective functions thermal shutdown maximum on time double protection for battery full-charge detection 7. small sson-10 package (2.5mm 2.7mm 0.6mm max) package sson-10 applications 1. digital still cameras 2. camera phones 3. pdas
mitsumi photo ash charge ic with a built-in igbt driver mm3456 block diagram vcc done igbt igbt ov 100k tsd control logic driver max on time i sw 40v dmos rp 100k rp 100k output voltage detection 1 + s r q secondary side zero current detection output voltage detection 2 secondary side over voltage detect pin (for second protection) sw vcc ipeak chg trig v out d1 t1 c1 vbat bat v zero c out gnd igbt driver enable iref uvlo1 uvlo2 trigger coil xenon flash lamp sson-10 (top view) 1 2 3 4 5 10 9 8 7 6 1 sw 2 bat 3 done 4 vcc 5 igbt 6 ov 7 ipeak 8 trig 9 chg 10 gnd pin assignment
mitsumi photo ash charge ic with a built-in igbt driver mm3456 pin no. pin name pin description 1 sw built-in dmos power fet drain pin. connect to primary side of the transformer. 2 bat battery voltage input pin. connect to + side of the battery pack. 3 done charge completion signal output pin (nch open drain output). l : charge completion, h : charge non-completion. 4 vcc power supply input pin. 5 igbt igbt gate drive output pin. connect to the gate of igbt. 6 ov secondary side overvoltage detection pin. (for second protection) please connect to the gnd when the input pin unused. (cf. applied circuit example) 7 ipeak primary side peak current setting pin. can set 3 phases of electric currents by gnd or vcc connection or opening. 8 trig flash signal input pin. 9 chg charge enable input terminal. h : charge on, l : charge off. 10 gnd ground pin. pin description
mitsumi photo ash charge ic with a built-in igbt driver mm3456 absolute maximum ratings item symbol ratings units operating temperature t opr - 40~+85 c vcc operating voltage v ccop 2.5~6.0 v bat operating voltage v batop 1.6~6.0 v recommended operating conditions item symbol ratings units storage temperature t stg ?55~+150 c bat, ipeak, chg, done, trig, igbt, ov, vcc pin input voltage v in ?0.3~+7.0 v sw pin voltage v sw ?0.3~+40 (note1) v power dissipation pd 2.25 (note2) w note1 : when in use, make sure that the voltage exceeding the maximum rating is not applied even momentarily. note2 : when mounted on a 40?0?.6tmm(copper foil area 50%, fr4) pc bord.
mitsumi photo ash charge ic with a built-in igbt driver mm3456 electrical characteristics (except where noted otherwise ta=25?, vcc=3.3v, vbat=3.6v) item symbol measurement conditions min. typ. max. units vcc supply current 1 i cc 1 charging (chg=3.3v) 1.3 5 ma vcc supply current 2 i cc 2 full-charge 110a vcc supply current 3 i cc 3 shutdown (chg=0v) 1a bat supply current 1 ibat1 charging (chg=3.3v) 20 35 a bat supply current 2 ibat2 shutdown (chg=0v) 1a uvlo1 detection voltage (vcc) v uvlo 1 2.2 2.3 2.4 v uvlo1 hysterisys v uvlo 1hys 100 mv uvlo2 detection voltage (bat) v uvlo 2 1.2 v sw peak current 1 ipeak1 vipeak=0v arank 0.9 1.0 1.1 a brank 1.5 1.6 1.7 sw peak current 2 ipeak2 vipeak=open arank 1.1 1.2 1.3 a brank 1.68 1.80 1.92 sw peak current 3 ipeak3 vipeak=3.3v arank 1.3 1.4 1.5 a brank 1.85 2.0 2.15 sw leakage current i swleak v sw =35v 1a sw on resistance r on i sw =0.8a 0.25 0.45 zero current ditection v zero vsw - vbat 50 100 mv full-charge detection 1 (v sw ) v cp 1 21.78 22 22.22 v full-charge detection 2 (v ov ) v cp 2 1.182 1.200 1.218 v ov input current i ov 0.1 a chg input voltage l v chgl 0.8 v chg input voltage h v chgh 2.0 v chg input resistance r chg chg - gnd resistance 100k done output voltage l vdone vcc=3.3v, rpullup=100k 0.1 v done sw leakage current idleak vdone=3.3v 1a trig input voltage l v tril 0.8 v trig input voltage h v trih 2.0 v trig input resistance r tri trig - gnd resistance 100k igbt pull-up resistance r pu igbt=0v 59 igbt pull-down resistance r pd igbt=3.3v 611 max on time tmax 100 s thermal shutdown temperature (note3) tsd 150 c note3 : the parameter is guaranteed by design
mitsumi photo ash charge ic with a built-in igbt driver mm3456 timing chart (1) normal charge start charge completion (2) switching cycle <6.0v <6.0v >1.6v >2.0v (vchgh) +vzero vbat <0.8v (vchgl) 300v 2.5v 0v 0v 0a 0v 0a h l ipeak ipeak/n vbat v out (capacitor voltage) i pri (primary-side current) i sec (secondary-side current) vcc bat chg sw done power on reset release power on reset charge restart charge start charge stop charge completion charge restart +v zero vbat 0v 0v 300v vbat sw 0a h l ipeak/n i sec (secondary-side current) 0a ipeak i pri (primary-side current) v out (capacitor voltage) p w t r on off on on off all typ numeric value.
mitsumi photo ash charge ic with a built-in igbt driver mm3456 application circuit (1) application circuit example 1 : normal vbat system h : charge on flash trigger vcc or gnd or open c1 vcc done ov chg ipeak trig igbt gnd bat sw t1 d1 v out vcc c out igbt trigger coil xenon flash lamp system h : charge on flash trigger vcc or gnd or open vcc done ov chg ipeak trig igbt gnd bat sw vbat c1 t1 d1 v out for over voltage protection. secondary side voltage detection. vcc c out igbt r1 r2 trigger coil xenon flash lamp (2) application circuit example 2 : ov pin (overvoltage protection) use ? we shall not be liable for any trouble or damage caused by using this circuit. ? in the event a problem which may affect industrial property or any other rights of us or a third party is encountered during the use of information described in these circuit, mitsumi electric co., ltd. shall not be liable for any such problem, nor grant.
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